|Publication number||US8187063 B2|
|Application number||US 12/415,494|
|Publication date||May 29, 2012|
|Filing date||Mar 31, 2009|
|Priority date||Mar 31, 2009|
|Also published as||EP2236329A1, EP2236329B1, US20100248604|
|Publication number||12415494, 415494, US 8187063 B2, US 8187063B2, US-B2-8187063, US8187063 B2, US8187063B2|
|Inventors||Junichi Kanemaru, Shinji Kakizaki, Daniel Yelles|
|Original Assignee||Honda Motor Co., Ltd.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (33), Non-Patent Citations (1), Referenced by (6), Classifications (12), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to an HVAC system for an automotive vehicle and more specifically to an HVAC system with an integrated evaporator and heating core.
As shown in
Another disadvantage to the conventional dual HVAC system 100 is that the rear HVAC unit 104 requires a longer refrigerant line 110 and heater core line 112. As shown in
Yet another disadvantage to the conventional HVAC system 100 is that the rear HVAC unit 104 occupies space in the center console 116 that can otherwise be utilized as storage space. As mentioned above, the rear HVAC unit is located in the center console 116 below the arm rest 118. A storage compartment 120 is located below the arm rest 118 and, as clearly show in
Thus, what is required is a dual HVAC system that overcomes the above mentioned disadvantages.
In accordance with one aspect, the present invention overcomes the above mentioned disadvantages by providing an HVAC system for a vehicle that includes a housing, a front HVAC unit housed in the housing and having a front blower, the front blower generating an airflow through a first airflow path, a rear HVAC unit housed in the housing and having a rear blower, the rear blower generating an airflow through a second airflow path, and an evaporator having a first portion and a second portion, a heating core having a first portion and a second portion, wherein when the rear blower is switched to an OFF position, the rear HVAC unit automatically operates the rear blower at a minimum voltage so as to continue to generate airflow through the second portion of the evaporator.
In accordance with another aspect, the present invention provides an HVAC system, wherein the rear HVAC unit includes a first damper door and wherein when the rear blower is switched to the OFF position the first damper door automatically rotates to a position so as to adjust a temperature of the airflow exiting the rear HVAC unit to match a temperature inside the vehicle.
In accordance with another aspect, the present invention provides an HVAC system, wherein the rear HVAC unit further includes a second damper door and wherein when the rear blower is switched to the OFF position the second damper door automatically rotates to a position to operate the rear HVAC unit in heat mode.
Additional benefits and advantages of the present invention will become apparent to those skilled in the art to which it pertains upon a reading and understanding of the following detailed specification.
The invention may take physical form in certain parts and arrangement of parts, a preferred embodiment of which will be described in detail in this specification and illustrated in the accompanying drawings that form a part of the specification.
Referring now to the drawings,
The front HVAC unit 16 includes a front blower 26, a front (or first) airflow path 28, a mixing door 30, and multiple airflow outlets 32 each having an airflow outlet door 34. The front blower 26 is located in the dashboard area off to the side of the HVAC system 10 behind a glove compartment (not shown), see
The mixing door 30, which is located between the evaporator 20 and the heating core 22, controls the temperature of the air through the front airflow path 28. Specifically, the mixing door 30 can be rotated to different positions to change the ratio of cold air that flows from the evaporator 20 directly to the front airflow path 28 and from the evaporator 20 through the heating core 22. The airflow from the evaporator 20 through the heating core 22 re-enters the front airflow path 28 and mixes with the cold air from the evaporator 20 to thereby form the correct temperature airflow that will exit through the multiple outlets 32. Thus, the temperature of the airflow through the front airflow path 28 and ultimately out one of the multiple airflow outlets 32 is adjusted by rotating the mixing door 30.
The rear HVAC unit 18 includes a rear blower 36, a rear (or second) airflow path 38, a first damper door 40, a second damper door 42, a rear heater outlet 44, and a rear vent duct 46, which leads to a rear vent outlet 48. The rear blower 36 extends into a front portion 50 of the center console 12, see
The second damper door 42 changes a rear operating mode of the rear HVAC unit 18. When the second damper door 42 is in a left position, as shown in
As shown in
A concern in HVAC systems is that the compressor may lock-up when the rear blower 36 is switched to an OFF position. To explain, an explanation of how compressor lock-up is prevented in the conventional HVAC system 100 described above is required.
The present invention overcomes potential compressor lock-up by operating the rear blower 36 at a minimum voltage when the rear blower 36 is in the OFF position to prevent the evaporator 20 from freezing. Referring to
However, to avoid compressor lock-up, when the occupant of the vehicle switches the rear blower 36 to the OFF position, the rear blower 36 continues to operate at a minimum level. Thus, air continues to flow through the second portion 56 of the evaporator 20. As a result, the temperature of the evaporator's fin and tube surface across the second portion 56 of the evaporator 20 does not drop below the freezing point and the condensation of the evaporator 20 does not freeze, see
An advantageous feature of the present invention is that when the rear blower 36 continues to operate at the minimum voltage described above when switched to the OFF position is that the occupants are unaware that the rear blower 36 is operating. The present invention accomplishes this in the following two ways.
First, when the rear blower 36 is switched to the OFF position the rear operating mode automatically operates the rear HVAC unit 18 in heat mode. If the rear HVAC unit 18 is in vent mode, the second damper door 42 will automatically rotate, if necessary, to operate the rear HVAC unit 18 in heat mode. For example, if the rear HVAC 18 unit is in vent mode the second damper door 42 will automatically rotate to change the rear HVAC from vent mode to heat mode. In heat mode the air is directed out the rear heater outlet 44, which typically is located near the floor of the passenger compartment and is, thus, undetectable to the occupants.
Second, when the rear blower 36 is switched to the OFF position the first damper door 40 is automatically rotated to adjust the temperature of the airflow from the rear heater outlet 44 to a same temperature inside the passenger compartment or inside temperature T(i). During normal operation of the rear HVAC unit 18 a position (P) of the first damper door 40 is determined by the following equation:
where T(o) is a calculated outlet temperature, T(e) is an evaporator outlet temperature, and T(h) is a heater outlet temperature. When the rear blower 36 is switched to the OFF position the inside temperature T(i) is substituted for the calculated temperature T(o), where the inside temperature T(i) is measured via a temperature sensor. Thus, the equation changes as follows:
Thus, the position P of the first damper door 40 automatically adjusts based on the above equation to keep the temperature inside the vehicle at a constant and, therefore, undetectable to the passengers.
Another advantage to the present invention, as mentioned above, is the larger storage compartment 51, see
Still another advantage to the present invention is the reduction in material and assembly costs due to the integration of both the front 16 and rear 18 HVAC units into a single housing, thus, requiring only one evaporator and heating core.
Still yet another advantage to the present invention is the reduction in material and assembly costs due the shorter refrigerant line from the condenser to the rear HVAC unit. The shorter refrigerant line also leads to a reduction in joints required to run the line from the condenser to the evaporator thereby decreasing the number of potential leak areas.
In summary, the present invention has several advantages over the conventional HVAC system, including decreased material costs, decreased assembly costs, reduction in potential leak areas, which leads to less maintenance costs, increased storage capacity just to list a few. In addition, comfort, convenience, and efficiency is not compromised due to the increased size of both the evaporator and heating core, as explained above.
While specific embodiments of the invention have been described and illustrated, it is to be understood that these embodiments are provided by way of example only and that the invention is not to be construed as being limited but only by proper scope of the following claims.
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|Cooperative Classification||B60H1/3214, B60H2001/3282, B60H1/321, B60H2001/00099, B60H2001/00135, B60H2001/002, B60H1/00064|
|European Classification||B60H1/32C1E, B60H1/00A2C, B60H1/32C1H|
|Apr 23, 2009||AS||Assignment|
Owner name: HONDA MOTOR CO., LTD., JAPAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KANEMARU, JUNICHI;KAKIZAKI, SHINJI;YELLES, DANIEL;REEL/FRAME:022586/0430
Effective date: 20090330
|Nov 11, 2015||FPAY||Fee payment|
Year of fee payment: 4